多窗谱估计法估计相干函数的双端语音检测

双端语音检测是声回波对消系统的重要组成部分。鉴于目前采用的基于相关的双端语音检测运算量较大,文中采用基于相干的双端语音检测方法,利用多窗谱估计法估计相干函数。该谱估计法能够利用较短的数据段获得可接受的频率分辨率而估计方差较小。软件仿真结果表明,基于相干的双端语音检测与基于相关的双端语音检测相比较,前者能够在不严重增大漏报概率的情况下大大提高运算效率。

Doubletalk Detection Based on Coherence Estimated by Multiple Window Spectrum Estimation Method

Doubletalk detection is an important part of echo cancellation system. In view of the computational complexity of doubletalk detection based on cross-correlation, a coherence-based method is employed. The coherence is estimated by the multiple window spectrum estimation technique. This method allows the data segment to be short in length while estimates with lower variance and an acceptable frequency resolution can be obtained. Simulation results indicate that computational efficiency of doubletalk detection based on coherence is improved better than that of doubletalk detection based on cross-correlation while the missing probability would not be increase seriously.